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2 Sheets-Sheet 21' (No Mode l.)

J,. H. BEARE. BOILER SORAPER..

No. 295, 54. Patented MemZE, 1884.

N. FETFRs Pmwumugn llsgrrnn STATES Parent tries.

JOSEPH HENRY BEARE, or'roMBsroNR, ARIZONA TERRITORY.

BOlLER-SCRAPER.

SPECIFICATION forming part of Letters Patent No. 295,85l, dated March 2 1 Applicatlon tiled July To (6 whom/it may concern: 7

Be it known that I, JOSEPH 11. BEARE, of Tombstone, county of Cochise, and Territory of Arizona, have invented an Improvement in Boiler-Scrapers; and I herebydeclare the following to be a full, clear, and exact description thereof.

My invention relates to a ne N and useful boiler-scraper for removing the scale from the tubes and shells of boilers and keeping them clean; and it consists in one or more framesections having internally-serrated annular bands surrounding the tubes, and radiating toothed wings for scraping the interior of the shell,and means for reciprocating said section or sections'within the boiler.

It consists, further, in details of construction whereby the tube-scrapers may be rendered expanding to enable them to move read ily, and by which the shell-scrapers may pass the rivets and seams of the interior, all of which I shall hereinafter fully explain.

The object of my invention is to remove scale from boilers by providing a suitable scraper, by theoccasional operation of which the result of keeping off the scale, as well as its removal, will be accomplished.

Referring to the accompanying drawings, Figure 1 is a transverse section of a boiler showing my invention within it. Fig. 2 is a longitudinal horizontal section of the same.

The scraper is here shown as constructed in three independent sections; but it may be made of more or fewer, according to the size and character of the boiler, the idea being to reach every portion of the interior circumfercentral crossbar, a

ence of the shell and the exterior surface of all the tubes by sections, which, by being independent maybe made light and easily hans ectioiiZDA A the side sec- Tescribing iifgli the section A, it consists of a rectangular or quadrilateral frame composed of end bars, a, side bars, a, and a all bolted together and secured by nuts 00, by the removal of which the bars may be separated for repairs, replacement, &c. The end bars consist of two separated or spaced bars, as shown in Fig. 2, for the purpose hereinafter described. bars arcround and have spiral springs Z) upon them. 7

The sidev 4N0 model.)

B represents the scrapers for the tubes 0, which they are shown to encircle in Fig. 1. These scrapers consist of semicircular bands having serrated or toothed inner surface. I have here shown these semicircular bands as being connected in pairs by a short intervening-bar, b, and each havin atits other side or end a projecting arm, b", which is slotted or notched upon the round side bars and lies against and between the coils of the springs 12. The semicircular bands which iuclose the halfcircumference of the top of the tubes are independent wholly of those which inclose the lower half-circumference;

D are the wings or scrapers for the shell of the boiler. These are made of plates of springsteel. They increase in width to their outer ends, to cover as much of the inner circumference of the shell as is required of the central section, and they increase in thickness to their inner ends for the sake of strength. Their inner ends fit between the spaced end bars, a, and are bolted therein, as shown. Their outer ends are serrated, and these teeth, as well as those upon the tube-scrapers, arepreferably beveled on their edges, to blunt them slightly, that while rendering them efficient in removing the scale, they may not be sharp enough to hurt the iron. The tapering wings, it will. be observed, provide for intervening spaces, which will permit the movement of the device within the boiler without interfering with the stays, which are usually placed in the head of steam-boilers. These stays. which I have not herein deemed necessary to illustrate, are well known, and consist of rods or braces riveted from the head of the boiler to the shell to strengthen it.

Connected with the central cross-bar, a is thepiston or draw rod E, by which the central section is drawn back and forth throughout the length of the boiler. This draw-rod extends outwardly through the head F of the boiler and through a stuffing-box, G, screwed thereon.

The side sections of my scraper are made in a manner similar to the central one, with but one exception-namely, the outer side bars of the rectangular frames. These I have lettered a, and they are constructed similarly to the end bars, a, for the purpose of receiving and securing the wings. The tube-scrapers extend their outer arms, 12 between these spaced bars and lie between springs e, secured therein. All the rest of the parts being similar to corresponding parts in the central section, I have designated them by the same letters.

It will be observed that the wings or shellscrapers D are sufficiently numerous and tapering to make a circumference adapted to reach the entire inner circumference of the shell.

In order to show the operation of my scraper, I show in Figs. 1 and 2 its application to a boiler. II is the boiler, F its head", S its shell, and 0 its tubes. The scrapers B encircle the tubes, while the wings D radiate to the inner circumference of the shell. By drawing out or forcing in the draw-rods E each or all of the sections may be moved back and forth throughout the length of the boiler and the scale removed from the tubes and shell. The scraper remains in the boiler, and by working it at suitable intcrvas the interior may be kept clean. This is its general opera tion; but particular advantages, which I shall now explain, flow from the several peculiarities of construction.

. It will be observed that the tube-scrapers are constructed in independent semicircular bands, having their ends resting on springs. These springs keep them well against the tubes, but allow them .independence to move up or down in case the tube should be sprung or bent in any way, and they will not stick or bind when used after some time, should there be lumps or heavy scales on the tubes.

The wings or shell-scrapers, as I have stated, are made of spring-steel. This is to allow them to pass over rivets and seams where the boiler-plates are riveted together, so that there will be no obstruction, and if one of the wings should be a little untrue and strike one of the boiler-stays it can spring past it.

This scraper can be fitted to old boilers and flue-boilers, and, if necessary, the tube-scrapers can be made in four parts instead of two, each part going a quarter round.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. Aboiler-scraper consisting of one or more frame-sections, annular internally serrated or toothed bands secured thereto and surrounding the tubes, toothed wings or shell-scrapers radiating from said frame-section to the inner circumference of the boiler, and a means for reciprocating said section or sections within the boiler, substantially as herein described.

2. In a boiler-scraper, the frame consisting of the end bars, a, side bars, a, and the springs 2) upon the side bars, a, in combination with the internally serrated or toothed independent semicircular bands or tube-scrapers B, having arms I)", slotted or guided on the side bars, a, and resting on the springs b, and a means for reciprocating said frame within the boiler, substantially as and for the purpose herein described.

3. In a boiler-scraper and means for reciprocating it within the boiler, in combination with internally serrated bands B, secured thereto and encircling the tubes, the toothed wings or shell-scrapers D, ex'tending from the frame to the shell, said wings being made of spring material, substantially as and for the purposes herein described.

4. In a boiler-scraper, a frame having side and end bars and a cross-bar, a, the annular internally-serrated tubescrapers 13, secured within said frame, and the toothed wings or shell-scrapers D, extending therefrom, in combination with the piston or draw 10d E, secured to the cross-bar a and extending through the head of the boiler, whereby the frame may be reciprocated, substantially as herein described.

5. A boiler-scraper consisting of the independent frame-sections A A A, the expanding annular internally-serrated tube-scrapers B, secured to said frames, the tapering toothed wings or shell-scrapers D, radiating from said frames, and the separate pistons or draw rods- E, secured to each frame, said rods extending through the head of the boiler, whereby said frames may be reciprocated independently, substantially as herein described.

6. In a boiler-scraper, the side sections, A A, consisting of the spaced end bars, a, the inner side bars, a, and the outer spaced side bars, 66*, the springs b on said bars a, and the springs 6 within said spaced bars a in combi nation with the internally serrated or toothed semicircular tube-scrapers B, having arms b guided on the side bars and resting on the springs, and the radiating shell-scrapers D, bolted in the spaced bars, substantially as and for the purpose herein described.

In witness whereof I have hereunto set my hand.

JOSEPH HENRY BEARE;

Witnesses:

J. S. TAYLOR, SUMNER P. 'VIcKERs. 

